During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Perhaps the most scandalous statue of America's first president.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

At this hidden studio, the dying art of taxidermy is alive and well.

Where Greenpoint's first European settler—and troublemaker—made his home.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

A prized globe signed by Amelia Earhart and Charles Lindbergh sits in the Brooklyn office of the American Geographical Society.

Final resting place of the immigrant who brought artificial seltzer water to America.